ssrs- Draw a diagonal line in a chart

I have a scatter chart.I have to compare the itemsold with the
profit made for each product
 
Horizontal axis: Itemsold(in numbers)(1,2,3,4,5) interval=1
Vertical axis: Profit(in lakhs)(1,2,3,4,5) interval=1

chartdata:

Values : Profit

Category Group: Itemsold

series: Product

I need to draw a diagonal line in the chart from (1,1) to (5,5).
Please help me to achieve this.